Garmin G1000 Nxi System Maintenance Manual page 278

GMA 1347D Test
Except for marker beacon operation, an in-aircraft checkout may be performed in the aircraft
with known good microphone, headset, and speaker.
Intercom System (ICS) Check
1. Ensure that the MAN SQ key is off (no light).
2. Adjust GMA1 and GMA2 ICS volume to a comfortable level.
3. Plug in a headset at each COCKPIT ICS position. One at a time, plug a headset into
each left and right CABIN ICS jack location (if installed) (one headset on right, one
headset on left).
4. Verify the following:
•
Two-way communication between each CABIN ICS jack position.
•
CABIN ICS position cannot hear the pilot and copilot.
•
CABIN ICS positions cannot be heard by the pilot or copilot.
5. On GMA1 select COM1 MIC and AUDIO.
6. Ensure INTR COM is deselected on GMA1 or GMA2. Verify an active (green) COM1
frequency is displayed on both PFDs.
7. On GMA1 or 2 select PA and verify the PA select annunciator is illuminated on GMA1
and GMA2. Verify COM1 active frequency is displayed white.
8. Initiate passenger address using pilot's headset boom mic by keying the pilot's PTT.
Verify the following:
•
Clear PA audio can be heard over cabin speaker and CABIN ICS headsets
•
PA selected annunciator on GMA1 flashes ~ once per second during PA
address.
9. Repeat Step 8 using pilot hand mic.
10. Initiate passenger address using copilot's headset boom mic by keying the copilot's PTT.
Verify the following:
•
Clear PA audio can be heard over cabin speaker and CABIN ICS headsets
•
PA selected annunciator on GMA1 flashes ~ once per second during PA
address.
11. Repeat Step 10 using copilot hand mic.
Transceiver Operational Check
Perform a ramp test radio check by exercising the installed transceivers, microphone,
microphone key and audio over the headphones and speaker. Verify that communications are
clear and PTT operation is correct for each pilot position.
1. On the pilot's audio panel, select the audio source corresponding to each installed
avionics unit (i.e. NAV1, NAV2, COM1, COM2, ADF and DME) and check for audio over
the pilot's headset.
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
Page 265
Revision 1